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Carcharodontosaur tooth 95mm F2956
Evolutionairy branching of species due to geographical changes. These changes spatially -and thus genetically- isolate the species, making it possible for new sister species to evolve. The formation of an inland sea, a mountain range, even continental shifts or changes in the climate could contribute to differential evolutionary drivers on the isolated populations, thus forcing them to follow different evolutionary paths and evolving into different species over time.
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